package com.example.demo.config;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;

import com.example.demo.entity.SysPermission;
import com.example.demo.entity.SysRole;
import com.example.demo.entity.UserInfo;
import com.example.demo.service.UserInfoService;


/***
 * 继承AuthorizingRealm 
 * @author 马瑞朝
 *
 */
public class MyShiroRealm extends AuthorizingRealm {

	
	@Autowired
	private UserInfoService userInfoService;
	
	/***
	 * 当访问到页面的时候，链接配置了相应的权限或者 Shiro 标签才会执行此方法否则不会执行
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
		System.out.println("权限配置-->MyShiroRealm.doGetAuthorizationInfo()");
	    SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
	    
	    UserInfo userInfo  = (UserInfo)principals.getPrimaryPrincipal();
	    for(SysRole role:userInfo.getRoleList()){
	    	//加入角色
	        authorizationInfo.addRole(role.getRole());
	        for(SysPermission p:role.getPermissions()){
	        	//循环放入权限信息
	            authorizationInfo.addStringPermission(p.getPermission());
	        }
	    }
	    return authorizationInfo;
	}

	/***
	 * 重写获取用户信息的方法
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {

		System.out.println("MyShiroRealm.doGetAuthenticationInfo()");
		// 获取用户的输入的账号.
		String username = (String) token.getPrincipal();
		System.out.println(token.getCredentials());
		// 通过username从数据库中查找 User对象，如果找到，没找到.
		// 实际项目中，这里可以根据实际情况做缓存，如果不做，Shiro自己也是有时间间隔机制，2分钟内不会重复执行该方法
		UserInfo userInfo = userInfoService.findByUsername(username);
		System.out.println("----->>userInfo=" + userInfo);
		if (userInfo == null) {
			return null;
		}
		SimpleAuthenticationInfo authenticationInfo = new SimpleAuthenticationInfo(userInfo, // 用户名
				userInfo.getPassword(), // 密码
				ByteSource.Util.bytes(userInfo.getCredentialsSalt()), // salt=username+salt
				getName() // realm name
		);
		return authenticationInfo;

	}

}
